commenter

Definition of commenter

: one who commentsespecially: one who leaves a comment on an Internet site, story, page, etc. … every blogger and commenter and self-anointed pundit, could outperform any robot writer at a fraction of the cost. — Paul Di FilippoMany websites which allow users to leave comments … use a system called Captcha to check that the commenter is not a computer programme (or 'bot') leaving spam comments. — Nick Poyntz